Ah, a whole book -- a collection from various teachers from the Japanese Zen koan tradition (with a sprinkling from Korean Seon and Chinese Ch'an) -- writing about one koan: MU! I wish I could have loved it, but I'm not a huge fan of koans. While some of the essays in this collection are brilliant, and inspiring, I found much of them overly jargonistic and repetitive. Some, like Barry Magid, John Tarrant, Kurt Spellmeyer, the contributions of the editors and even Elaine MacInnes, whose Christianity and mysticism turns me off, are truly creative and provoke deep insight. But much of the others come off as merely mouthing the standard Zen bravado and grand-standing, using words to obfuscate more than clarify.
SO, uneven, I cannot truly say "I like it" and won't likely be recommending it to many of my students. For the general reader, I will still be recommending Bring Me The Rhinoceros by John Tarrant, Elegant Failure by Richard Shrobe and even Sitting With Koans edited by John Daido Loori.